Atom

The atom is a basic building block of matter. Everything around us like plants, animals, air, water, sun, earth, planets and people are all made up of atoms. It is the smallest unit of an element that still exhibits all the chemical properties unique to that element. Atoms consist of a tiny dense central nucleus made of protons and neutrons, surrounded by a cloud of electrons.

Learn about the properties of the nucleus and why they are important to defining what an atom actually is. Chemistry tells us how 3 tiny particles - the proton, neutron and electron - come together in trillions of combinations to form ... everything. Learn about: Atoms, Composition of Atoms, Atomic Number, Isotopes, Relative Atomic Mass, Mass Number.

Video us on a journey through the history of particle physics. In this episode we learn that the Greeks knew about atoms and how Mendeleyev's periodic table was among the first clues that the atom had a deeper structure.

The lesson shows how the elements are the building blocks of all matter. It describes the atoms, bonds between atoms, molecules, atomic number, atomic mass (weight), isotopes, atomic excitation and ionization.

Atoms are the smallest identifiable piece of matter that make up the building blocks of every physical thing. Understand the definition of an atom with important facts from a science teacher in this lesson on fundamental physics.